Cisco ONS 15454 Troubleshooting Manual page 257

Chapter 2 Alarm Troubleshooting
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Refer to the Cisco ONS 15454 Reference Manual for a description of the G1000-4 card's end-to-end
Ethernet link integrity capability. Also see the
alarms that occur when a point-to-point circuit exists between two cards.
Ethernet card ports must be enabled for CARLOSS to occur. CARLOSS is declared after no signal is
received for approximately 2.5 seconds.
For more information about Ethernet cards, refer to the Cisco ONS 15454 and
Note
Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide.
Clear the CARLOSS (G1000) Alarm
Verify that the fiber cable is properly connected and attached to the correct port. For more information
Step 1
about fiber connections and terminations, refer to the "Install Cards and Fiber-Optic Cable" chapter in
the Cisco ONS 15454 Procedure Guide.
Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Caution
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
If the fiber cable is correctly connected and attached, verify that the cable connects the card to another
Step 2
Ethernet device and is not misconnected to an OC-N card.
If no misconnection to the OC-N card exists, verify that the attached transmitting Ethernet device is
Step 3
operational. If not, troubleshoot the device.
Verify that optical receive levels are within the normal range. The correct specifications are listed in the
Step 4
"1.12.3 OC-N Card Transmit and Receive Levels" section on page
Step 5 If the alarm does not clear, use an Ethernet test set to determine whether a valid signal is coming into
the Ethernet port. For specific procedures to use the test set equipment, consult the manufacturer.
If a valid Ethernet signal is not present and the transmitting device is operational, replace the fiber cable
Step 6
connecting the transmitting device to the Ethernet port. To do this, refer to the "Install Cards and
Fiber-Optic Cable" chapter in the Cisco ONS 15454 Procedure Guide.
If the alarm does not clear, and link autonegotiation is enabled on the port but the autonegotiation process
Step 7
fails, the card turns off its transmitter laser and reports a CARLOSS alarm. If link autonegotiation has
been enabled for the port, determine whether there are conditions that could cause autonegotiation to
fail:
a.
b.
November 2009
If a problem exists in the end-to-end path (including possibly the far-end G1000-4 card), it causes
the reporting card to turn off the Gigabit Ethernet transmitter. Turning off the transmitter typically
causes the attached device to turn off its link laser, which results in a CARLOSS on the reporting
G1000-4 card. The root cause is the problem in the end-to-end path. When the root cause is cleared,
the far-end G1000-4 port turns the transmitter laser back on and clears the CARLOSS on the
reporting card. If a turned-off transmitter causes the CARLOSS alarm, other alarms such as the
"TPTFAIL (G1000)" alarm on page 2-248
normally accompany the CARLOSS (G1000) alarm.
Confirm that the attached Ethernet device has autonegotiation enabled and is configured for
compatibility with the asymmetric flow control on the card.
Confirm that the attached Ethernet device configuration allows reception of flow control frames.
or OC-N alarms or conditions on the end-to-end path
"TRMT" alarm on page 2-250
1-146.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2.7.54 CARLOSS (G1000)
for more information about
2-63